"On 10-31-2001, we got the user-level prototype working. On 10-31-2002, we got the first in-kernel mount. And today, 10-31-2005, we integrated into Solaris. ZFS will hit the street in a couple of weeks via Solaris Express."

Well, I don't think you made that format up, it has been used as the internal date format in dBase since dBase III hit the streets in June of 1984. I can't vouch for other database or application formats, but this one is well documented.